Haloalkanes and...

Which one of the following compounds is stable? 

$$ (X) +KCN  \longrightarrow CH_3CN \quad  \xrightarrow {2H_2/Ni} CH_3CH_2NH_2 $$ what is (X) ?

Which of the following is liquid at room temperature?

Which of the following is the least reactive towards
nucleophile? 

Which of the following is the most reactive towards nucleophilic substitution reaction?

Identify the correct order of reactivity in electrophilic substitution reaction of the following compounds.

Identify the optically active compounds from the following.

 The product W is:

A diabasic organic acid (A) on heating gives (B). The compound (B) on soda lime treatment gives the lowest alkane which can be prepared by Wurtz synthesis. The compound (A) is

The compound $$C_8H_9Cl (A)$$ on treatment with $$KCN$$ followed by hydrolysis gives $$C_9H_{10} O_2 (B) .$$ Ammonium salt of $$B$$ on dry distillation yields $$C$$, which reacts with an alkaline solution of bromine to gives $$C_8H_{11}N. (D).$$ Another compound $$E (C_8H_{10}O)$$ is obtained by the action of nitrous acid on $$D$$ or by the action of aqueous potash on A. E on oxidation gives $$F (C_8H_6O_4)$$ which gives the inner anhydride G on heating. The compound D is reaction with $$CHCl_3+NaOH $$ gives a compound H.

The compound $$A$$ on reaction with $$AgCN$$ gives :